These books are fourth grade level according to IRLA (Dork Diaries are fifth grade):
AuthorTitle
Applegate, KatherineOne and Only Ivan
Bell, CeceEl Deafo
Bowen, FredReal Hoops
Brouwer, SigmundSewer Rats
Byars, BetsyThe Summer of the Swans
Clements, AndrewNo Talking
Colfer, EoinLegend of Spud Murphy
Cosson, M. J. Rock Art Rebel
Creech, SharonGranny Torelli Makes Soup
Creech, SharonLove That Dog
Dahl, MichaelTroll Hunters series (white or black)
Davies, JacquelineLemonade War, The
DeClements, BartheThe Fourth Grade Wizards
Kehret, PegBlizzard Disaster, The
Kehret, PegVolcano Disaster, The
Maddox, JakeSoccer Shootout
Paulsen, Gary and Paulsen, JimRoad Trip, The
Poblocki, DanShadow House Series
Spinelli, JerryWringer
Tarshis, LaurenI Survived Series
Telgemeier, RainaBaby Sitters Club Series (graphic novels)
Telgemeier, RainaDrama
Telgemeier, RainaGhosts
Weeks, SarahRegular Guy

​These are third grade level:​
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AuthorTitle
Burke, J. Deadly Doll, The
Cosson, M. J.Having It All, Coming to America from Mexico- 1920
Coy, JohnHoop Genius: How a Desperate Teacher and a Rowdy Gym Class Invented Basketball
Dahl, MichaelDragonBorn series
Dahl, MichaelLD series
Dahl, MichaelDragonblood series
Dahl, Michael Troll Hunters series 
Maddox, Jakesports book series
Zucker, JonnySpeed Star (Rex Jones)
Zucker, JonnyCreature Chase (Rex Jones)
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Kim Musket
School Librarian
Webmaster
James H. Moran Middle School